Fire-bar applicable for steam-boiler and other furnaces.



I E. BENNIS. FIRE BAR APPLICABLE FOR STEAM BOILER AND OTHER FURNACES.

APPLICATION FILED JUNE 12, I906.

PATENTED JUNE 9, 1908.

2 SHEETSSHEET 1.

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FIRE BAR APPLICABLE FOR STEAM BOILER AND OTHER FURNACES.

APPLICATION FILED JUNE 12, 1906.

2 SHEETS-SHEET 2,

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UNITED s EDWARD BENNIS, OF ASTLEY BRIDGE, BOLTON, ENGLAND.

FIRE-BAR APPLICABLE FOR STEAM-BOILER AND OTHER FURNACES.

Specification of Letters Patent.

Patented June 9, 1908.

Application filed June 12, 1906. Serial No. 321,388.

To all whom it may concern:

Be it known that I, EDWARD BENNIS, British subject, and resident of Astley Bridge, Bolton, county of Lancaster, England, have invented certain new and useful Improvements in F ire-Bars Applicable for Steam- Boiler and other Furnaces, of which. the fol.- lowing is a specification.

This invention is designed primarily for steam boiler furnaces fed by mechanical stokers and relates to hollow fire bars into or through which air is driven or forced by a jet of steam or otherwise.

The object of the present invention is to increase the air supply or the quantity of air forced into or through the bars without in creasing the lateral size or width of the bars.

As hitherto constructed the head of the bar has generally been circular in cross section throughout its length, with a flaring or trumpet shaped mouth also circular in cross section, the bar head from the flaring mouth for a given distance gradually increasing in diameter to the point where it joined the bar proper. I now find after years of experience and experiment that by altering the shape of the bar head to give the flaring mouth an oval form without increasing the width and also by extending the head beyond the tapering circular part in an oval form I obtain a great increase in the quantity of air that can be forced through with a given steam or other jet thereby increasing the efficiency and the work done without enlarging the width of each bar or decreasing the number of bars in the furnace.

The invention consists essentially in constructing the fire bar head with a flaring or trumpet mouth of approximately oval section a tapering portion of circularor oval section and an additional portion of an approximately oval section with the sides parallel and the top and bottom tapering. Or the bar may taper directly from'the neck of the flaring or trumpet shaped mouth to the oval shaped end of the head where it joins the bar The invention will be fully described with reference to the accompanying drawings.

Figure 1. Longitudinal vertical section of bar head. Fig. 2. Front elevation of the flaring or trumpet shaped mouth. Fig. 3. Sectional plan. Fig. 4. Transverse section Fig. 5. Transverse section on line yy. Fig. 6. Transverse section on line .22. Fig. 7. Longitudinal vertical section of short bar head. Figs. 8 to 11. Similar views with relation to Fig. 7 as Figs. 2, 4, 5 and 6. Fig. 12. Longitudinal vertical section of bar head ta ering directly from neck to end. Fig. 13. Front elevation of same. Fig. 14. Transverse sectionon line 0cx Fig. 12. Fig. 15. Transverse section on line 2-z.

I prefer to construct the bar head with a central portion A between the lines acx and y-y of circular cross section gradually tapering or increasing in diameter from the line w0c to the line y'y in the ratio of about one inch to one foot.

The flaring or trumpet shaped mouth B I construct of an oval form that is I increase the depth from the top to the bottom without increasing the width from side to side. I preferably make the top I) and the bottom I) each of a semi-circle with thesides b that connect these two semi-circles by straight or flat sides, see Fig. 3.

The flaring or trumpet mouth B thus tapers or contracts from the oval form at the exterior to a circular form on the line 0cw.

At the other end of the central portion A I form or attach an additional part 0 from the line y-@ to the line zz such part 0 being circular in cross section on the line and of an oval or approximately oval form on the line zz. This part is constructed in a similar way as the trumpet mouth B. The top 0 and the bottom a are semi-circular and the sides 0 are flat or straight. The part gradually increases in depth while remaining the same in width as shown by the wedge shaped diagram in dotted lines showing an increase of about one inch to the foot or slightly less so that the bar head where it joins to the bar at Z will be an oval with straight or flat sides Fig. 6.

The modification shown in Fig. 7 is similar to that described the part 0 from y to e be ing shorter.

While I prefer to construct the central part A of the bar head of circular cross section it may be also of an oval form. shown in Figs. 12 to 15 the bar head may taper directly from the neck to the end. By this construction of bar head I get in a given width of bar a greatly increased amount of air blown into the restricted area necessary for the furnace work by the same steam jet as hitherto used. Six, eight, nine or more bars with heads of this construction in one Or as furnacew-ill, 1 estimate, convey ne'arly 100%- more air without any greater expenditure of steam.

What I claim as my invention and desire to protect by Letters Patent is mouth B of approximately oval formand an additional portion C of approximately 'oval form substantially as described.

\ 2. In 'a bar head for hollow :fir'e bars through which air is 'forced the combination with-a main portion theshape-o'f which-gradually alters from a circular section at the neck to :an approximately oval section of greater area at the end without increasing in 3 width, 'of a ifiaring :sh-aped mouth B of ap- 1. In a bar head for hollow fire bars through which air is forced the combination with a central tapering portion A of circular cross section, of a flaring trumpet shapedi proximately oval form, substantially as described.

In Witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

EDWARD BENNIS.

Witnesses:

J. 'OW-DEN GBRIEN, BARNFAT-HER. 

